EP1718464B1 - Druckverfahren und druckvorrichtung für vliesstoff - Google Patents

Druckverfahren und druckvorrichtung für vliesstoff Download PDF

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Publication number
EP1718464B1
EP1718464B1 EP04720966.3A EP04720966A EP1718464B1 EP 1718464 B1 EP1718464 B1 EP 1718464B1 EP 04720966 A EP04720966 A EP 04720966A EP 1718464 B1 EP1718464 B1 EP 1718464B1
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EP
European Patent Office
Prior art keywords
woven
equipment
fabric
printing
support
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04720966.3A
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English (en)
French (fr)
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EP1718464A1 (de
Inventor
Vittorio; c/o Orlandi S.p.A. ORLANDI
Roberto Pedoja
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Suominen Oyj
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Suominen Corp
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Publication of EP1718464A1 publication Critical patent/EP1718464A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/003—Special types of machines for printing textiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2200/00—Printing processes
    • B41P2200/10—Relief printing
    • B41P2200/12—Flexographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2200/00—Printing processes
    • B41P2200/30—Heliography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2200/00—Printing processes
    • B41P2200/40—Screen printing

Definitions

  • the present invention relates to a process and equipment for creating prints on non-woven-fabric (NWF) of the spun lace type hydroentangled NWF and, particularly, relates to a process and to equipment which allows the creation of colour prints on spun-lace type non woven fabrics at high speed whilst at the same time maintaining optimal print quality.
  • the print may be made on dry NWF or on wet NWF.
  • printing on fabrics in general may be carried out in a substantially direct, indirect manner, by discharge or by resist independently of the type of process used.
  • the direct method the most common in the field, consists of applying the ink or paste (which is subsequently polymerised and dried) directly onto the fabric and subsequently vaporization in order to fix said ink or paste onto the fibres of the fabric.
  • direct printing may be carried out by using conventional roller printing or flat screen printing procedures see DE 3744000 for instance.
  • the method provides the use of equipment essentially consisting of a large drum, defined as the roller press, on which roll a number of engraved rollers, as many as the number of colours to be reproduced.
  • the roller press on which roll a number of engraved rollers, as many as the number of colours to be reproduced.
  • there are two rollers for each dye one is used for transporting the dye and the other for taking up and depositing the dye.
  • Passing between the engraved rollers and the press roller, held tensioned are the fabric to be printed and a continuous mesh providing a backing function.
  • the ink is provided to the engraved rollers by a brush and by one of said rollers which takes it up from an underlying tray, whilst a metallic blade eliminates any excess ink.
  • non-woven-fabric being a soft, stretchable and easily creased material
  • the fibres which make it up are subjected to crushing pressure and to a dragging force which will cause its elongation or stretching in the longitudinal direction with respect to the length of the non-woven-fabric and, by way of reaction, a "shortening" or shrinkage of the width of the non-woven-fabric.
  • the non-woven-fabric instead tends to return to relaxed conditions or even to form creases, precisely in response to being released from the tensioning to which its fibres have been subjected.
  • creases does not allow the attainment of a substantially flat surface onto which an acceptable print, especially one using many colours, may be achieved.
  • US 5743184 shows a press able to print a variety of substrate by controlling the angular speed of the printing body.
  • the printing press for paper in US 6092466 controls speed and torque moment.
  • this system will have to be such as to be compatible with maintaining such a material advancement speed through the equipment as to allow the economically acceptable productivity of the printing process.
  • the technical problem at the heart of the invention is therefore that of providing equipment for printing on non-woven-fabric (spun-lace) which allows obviating the drawbacks just mentioned and at the same time satisfying the needs mentioned, obtaining not only monochrome, but multicolour prints.
  • a first object of the present invention is therefore to provide an equipment for printing on non-woven-fabrics (spun-lace, spun-bonded, mechanically needle entangled, entangled and coated) also multicolour, on wet or dry product, directly on a production line or off-line.
  • a second object of the invention is to provide a printing process of non-woven-fabrics (spun-lace) that is adequate for the above specified purpose.
  • non-woven-fabric identifies a material produced from the binding of natural and/or synthetic fibres and/or threads using various methods different from the weaving of typically textile based materials.
  • the non-woven-fabric can consist of one or more layers of said material. This material is used for the production of hygiene products (household and personal), medical products and linen in general, furnishing fabrics, floor coverings, reinforcing for garments, sanitary items, cleaning materials such as dusters, abrasives, clothing items in general, household items such as mats and the like, table cloths and the like, bags or sheets for packing, handkerchiefs, curtains.
  • non-woven-fabric "backing" web is generally used in the field in order to indicate a continuous sheet of non-woven-fabric on which, according to the present invention, a monochromatic or multicolour printing process is carried out.
  • spun lace is meant a type of non-woven-fabric or a type of technology for obtaining said material wherein fibres of polyester (PE), polypropylene (PP), PLA (polylactates), PVA (polyvinylalcohol), polyethylenesulphone (PES), acrylic polymers, lyocell® (i.e. fibres of regenerated cellulose, obtained by the procedure of dissolution and spinning in organic solvent, without the formation of derivatives), tencell® (three layered products with fibres on the two outer sides and fluff pulp in the middle or two layered fibre/fluff pulp products), cotton, viscose are generally short fibres which are interconnected through a hydroentangled process.
  • PE polyester
  • PP polypropylene
  • PLA polylactates
  • PVA polyvinylalcohol
  • PES polyethylenesulphone
  • acrylic polymers i.e. fibres of regenerated cellulose, obtained by the procedure of dissolution and spinning in organic solvent, without the formation of derivatives
  • spun-bonded indicates a type of non-woven-fabric or a type of technology for obtaining said material wherein synthetic fibres such as polyamides, polyethylenes, polyesters, polyethylenesulphones, lyocell® and tencell® are extruded through a spinneret and the emerging filaments are bombarded with a jet of compressed air which causes the elongation of said fibres (long fibres) and their electrostatic charging such as to cause their mutual repulsion which results in their radom falling onto a conveyor belt.
  • synthetic fibres such as polyamides, polyethylenes, polyesters, polyethylenesulphones, lyocell® and tencell® are extruded through a spinneret and the emerging filaments are bombarded with a jet of compressed air which causes the elongation of said fibres (long fibres) and their electrostatic charging such as to cause their mutual repulsion which results in their radom falling onto a conveyor belt.
  • thermo-bonded indicates a type of non-woven-fabric or a corresponding technology wherein synthetic or natural fibres of different type are bound together through heating which causes either the melting of a thermoplastic component of the fibre, or the melting of a binder added to the fibre as the bonding agent, such as an acrylic derivatives based agent, synthetic or natural rubber latex or other synthetic polymers.
  • the term "height" in reference to non-woven-fabric indicates the width, in the transverse direction with respect to the length, of a single layer of material which is subjected to the printing process in suitable equipment.
  • the term "grammage” defines the weight of the non-woven-fabric per square metre.
  • on-line is in reference to a process which is carried out substantially uninterruptedly along a production line itself, comprising several operating stations directly connected to one another.
  • off-line is instead in reference to a particular manufacturing process of a non-woven-fabric which is carried out separately with respect to a production line, in reference to a different procedure or treatment of said non-woven-fabric.
  • the numeral 1 generally indicates an equipment for printing on non-woven-fabric.
  • Said equipment 1 comprises a press roller 2, also called support roller, at least one engraved roller 3 or printing body, means 4 for holding the sheet of non-woven-fabric on the support 2, a water separator 5, a control and command unit 6 (illustrated diagrammatically in figure 2 ) and guide means A, B, C, D, E, F suitable to guide and support a sheet of non-woven-fabric being inlet and outlet from said equipment 1.
  • the press roller 2 is a conventional roller , in which however, through holes 21 have been made along its entire circumferential band 22. These through holes 21 allow communication between the outer surface of the circumferential band 22 and the interior of the press roller 2.
  • the support press roller 2 is known to operate as the central rotatably-driven roller on the outer circumferential band 22 surface of which the material T is supported which must be subjected to printing.
  • At least one rotatably-driven engraved roller 3 is placed about said press roller 2.
  • said at least one engraved roller 3 is constituted by a plurality of rotating engraved rollers 3 (only two are illustrated in the figure) having the function of printing text, colours and/or drawings on the material T supported by the press roller 2.
  • the plurality of engraved rollers 3 more preferably consists of a number from 2 to 12, and each roller forms a character, a script, a drawing and/or a colour on the fabric T when this is transported through and pressed between the press roller 2 and the corresponding engraved roller 3.
  • One roller is sufficient in the case of monochromatic printing.
  • each engraved roller 3 may be driven by an independent motor 3M.
  • driven holding means 4 preferably being suction fans having the function of sucking forced hot air over the outer surface of the circumferential band 22 of the press roller 2, as shown in figure 1 by the wavy arrows, by means of conventional dye drying equipment, not shown (usually, the temperature of the hot air ranges between 50° and 80°C).
  • the suction fans 4 may be, for example, by simple, entirely conventional fans (not shown), operated by a motor 4M (illustrated diagrammatically in figure 2 ), itself also entirely conventional, such as to suck air from the outside of the press roller 2 towards the inside thereof through the through holes 21.
  • said suction fans 4 are pumps of the suction pump or compressor type.
  • the function of the suction fans 4 and the through holes 21 made in the circumferential band 22 of the press roller 2 is that of keeping the non-woven-fabric support firmly anchored onto the press roller 2 in order to ensure that, on the one hand, said support does not move during transport along the printing path and on the other hand counteract the formation of said creases.
  • said suction fans 4 are connected to a water separator 5, entirely conventional and diagrammatically illustrated in figure 1 , in the case where the non-woven-fabric T to be printed is wet.
  • the equipment may be provided with one or more water separators connected to each suction fan.
  • the water separators 5 may be, for example, conventional condensers wherein a fluid is firstly compressed by a compressor and then allowed to expand within a path (coil) to be cooled down.
  • the air sucked in by the suction fans 4 is directed onto the cold surface of the coil, such that the contact with a colder surface causes the release of the water contained thereinto in the form of condensation.
  • the separation of the water occurs purely by mechanical and physical action (centrifugal force and different specific gravity) within a conventional coclea-shaped distillator screw operating according to the principle of a coil still.
  • the guide means A, B, C, D, E and F are driven rollers.
  • said guide means are individually and independently motorised.
  • roller A is positioned upstream of the equipment, or rather prior to the printing station entrance. This roller A is used for transporting a non-woven-fabric backing directly from the production line (not shown) to the equipment 1 for printing so to have an in-line printing process.
  • rollers B and C are positioned in proximity to the press roller 2 at the non-woven-fabric T entrance into the printing station.
  • Rollers B and C are mechanically widening means, i.e. they allow increasing the height of the product and avoiding the formation of creases on the NWF support in the trasversal direction with respect to the length.
  • the NWF when subjected to stretching in the longitudinal direction with respect to its length, undergoes a shortening of its height (width).
  • the widening means in question have therefore the function of restoring the original height of the NWF support.
  • Rollers D, E and F are positioned upstream of the equipment 1, or rather at the end of the printing process. Said rollers D, E and F, have the function of correctly managing (stretch control) the NWF up to the subsequent machine, whether that be a drying oven (in the case of wet printing) or a winder (in the case of dry printing).
  • the equipment 1 is provided with a control and command unit 6, represented in figure 2 , having the function of independently controlling and monitoring the driving of all the rotating bodies 2, 3, A, B, D, E, F as well as the suction fans and any possible pumps.
  • a control and command unit 6 represented in figure 2 , having the function of independently controlling and monitoring the driving of all the rotating bodies 2, 3, A, B, D, E, F as well as the suction fans and any possible pumps.
  • control and command unit 6 is operatively directly connected with all mechanical and/or electronic components of the equipment 1 such as to create a single electrical axis for all the components.
  • Said control and command unit 6 is indeed arranged so as to detect electrical signals originating from all the rotating bodies, turn said signals into numerical values representative of the status of their angular speed and torque moment, comparing said numerical values with ratios of pre-established numerical values for said angular speed and said torques and sending signals to said rotating bodies in order to correct any possible variations in said values which fall outwith said ratios.
  • control and command unit 6 is directly and independently connected to the motor 2M of the press roller 2, each motor 3M of the engraved rollers 3, each motor AM, BM, CM, DM, EM, FM of the guide rollers A, B, C, D, E, F as well as to the motor 4M of the suction fans 4 and the motor 5M of any possible water separator 5.
  • the electrical signals are turned into parameters, indicative, for example of the angular speed of the rotating bodies and the couple (torque moment).
  • the angular speed of the bodies are then compared with one another and referred to preset values fixed for each different body and produced as a function of their inherent characteristics (weight, resistance, elongations).
  • said preset values are calculated such as to set their ratios defined according to the physical characteristics of the non-woven-fabric or, in other words, according to the typology of the non-woven-fabric, as illustrated in the introductory section of the present description. Accordingly, the drive system and all the rotating bodies must be coordinated such that the feeding of the non-woven-fabric within the equipment does not cause the above mentioned creasing effects.
  • the control and command unit 6 sends electrical signals to the aforesaid motors so as to correct any possible variations in said preset angular speed values when they fall outwith the defined ratios.
  • control and command unit 6 constantly monitors the individual angular speeds of the rotating bodies recording any variations which may occur following any inconsistency in the physical characteristics of the non-woven-fabric sheet, or for example, any variations in thickness, weight or humidity. These variations may cause elongation of the fibres of the non-woven-fabric sheet between one printing station and the subsequent one. Consequently, the print may be altered. Hence, the control and command unit 6 acts on the angular speeds of the rotating bodies themselves in order to balance out any possible stretching effects.
  • control and command unit 6 also receives electrical signals from the suction fans 4 and from the water separator 5.
  • the transport of the non-woven-fabric through the various printing stations, i.e. the engraved rollers 3, may be finely adjusted by keeping the non-woven-fabric support well anchored to the support constituted by the press roller 2.
  • the suction and any possible condensation of water may be calibrated according to the typology of non-woven-fabric thus constantly maintaining optimal printing conditions.
  • control and command unit may also act on the control of the dyes deposited by the engraved rollers 3 by controlling flow, pressure and viscosity.
  • the equipment 1 for printing on non-woven-fabric allows on the one hand keeping the material support well anchored onto the press roller 2 by means of the suction system, and on the other hand avoiding any undesired elongation of the fibres thanks to the arrangement of the control and command unit 6 on the individual motors of the rotating bodies in order to have the same electrical axis, and in part also thanks to said suction system.
  • the closed loop control comprises an image acquiring device 7, represented diagrammatically in figure 2 , operatively connected to the control and command unit 6 and suitable to constantly control the non-woven-fabric support in order to detect the presence of any creases or variations in the printing with respect to the preset standard.
  • the image acquiring device 7 may be for example a camera or a video camera.
  • a colour digital video camera is particularly preferred, able to film a portion of NWF, for example being outlet from a printing station.
  • the image acquired by the video camera is sent to the control and command unit 6 in the form of electrical signals and converted by said unit into digital data.
  • These digital data are compared with standard data stored in the memory of the control and command unit 6 and representative for example of a text or drawing which must be reproduced on the NWF.
  • a suitable program loaded in said command and command unit will run the comparison operation of the aforesaid data and in the case where it would detect any differences, then it will send electrical signals to the various printing bodies with the aim of modifying, for example, their angular speed in order to correct the error.
  • the presence of creases along the NWF may be detected by said video camera 7 and corrected in an entirely similar way to that explained previously.
  • a further object of the present invention is a process for the printing of non-woven-fabric. Said process comprises the following sequential steps:
  • the process comprises a step wherein the motors which operate the rotating bodies of the equipment are separately controlled electronically by a control and command unit such as to make reference to the same electrical axis.
  • the aforesaid control with the aim of having the same electrical reference axis for the motors of the rotating bodies refers to what explained previously with reference to the equipment.
  • the monitoring by the control and command unit may be implemented thanks to additional closed loop automatic control comprising the aid of a video camera such as that described above.
  • the process may also advantageously include an operation step of holding means in order to hold the non-woven-fabric sheet on the outer surface of the support.
  • the holding means operation step may be carried out using the aspirators described with reference to the equipment which, by sucking air from outside the press roller through the through holes made in the circumferential band, hold the non-woven-fabric in position with the aim of ensuring the correct execution of the printing (print ratio between different dyes/shapes).
  • the method of the invention also comprises a control step of the operating motor for the suction fans 4 by said control and command unit, such as to be able to vary the suction force according to the typology of non-woven-fabric supported and transported by the press roller 2.
  • a control step of the operating motor for the suction fans 4 by said control and command unit such as to be able to vary the suction force according to the typology of non-woven-fabric supported and transported by the press roller 2.
  • the non-woven-fabric is a multilayer, then it will be necessary to increase the suction force with respect to a monolayer non-woven-fabric.
  • the process may comprise a water separation step from the air sucked by the suction fans.
  • Said separation step is preferably carried out using separators as previously exemplified with reference to the equipment.
  • the printing step is carried out through standard flexographic (ink) or serigraphic (coloured paste) methods, whereby they will not be described herein in any further detail. It should be noted however that the process and the equipment of the invention allow printing text and/or drawings/figures with as many dyes as there are engraved rollers arranged about the roller press. Preferably, printing may be carried out with from 2 to 12 dyes and the process may consequently include a dye management step.
  • the method may comprise an enlargement stage in order to ensure, besides the above stretching control, also the maintenance of the height of the product.
  • the non-woven-fabric which may be subjected to the printing process of the invention preferably consists of the fibres listed in the introductory section of the present description, individually or in mixed products or three-layered products with cellulose pulp, or "fluff pulp” in the centre or in two fibre/fluff pulp layers.
  • non-woven-fabric provides the deposition of said fibres, in an entirely conventional manner, whilst in the molten state on a mat and left to solidify to form a layer or film. Afterwards, the film is normally consolidated using treatments such as those defined in the introductory section of the description.
  • the non-woven-fabric is formed in accordance with the spun-lace method, then it has grammage characteristics comprised of between 30 and 150 g/m 2 and fibre lengths comprised of between 0.8 mm and 6 mm (short mono- and bi-component fibres) and fluff pulp with length following mechanical "opening" ⁇ 2.5 mm.
  • the non-woven-fabric thus obtained in the form of a single film may be directly subjected to the printing process according to the invention, or may be first further processed in order to obtain a composite material.
  • non-woven-fabric composite materials are sandwich type structures comprising two outer layers obtained with the spun-lace or spun-bonded method, between which there is generally a cellulose or cellulose derivative pulp layer, subsequently hydroentangled.
  • composite non-woven-fabric normally provides the deposition of a first layer of non-woven-fabric on a suitable backing, the deposition on said first layer of cellulose pulp, the deposition of a second layer of non-woven-fabric, consolidation by hydroentangling and final drying.
  • a hydraentangling step may be carried out followed by drying.
  • the non-woven-fabric may be printed on both whilst wet and dry. If the product subjected to printing is wet, the percentage of residual humidity is generally comprised of between 80% and 200% with respect to the weight of the dry product. If instead, the product subjected to printing is dry, the percentage of residual humidity may vary from 0% to 10%.
  • the equipment and process in accordance with the invention allow obtaining a multicolour printed non-woven-fabric having a height up to 3500 mm, preferably a height ranging between 30 and 3500 mm, even more preferably ranging between 100 and 3500 mm.
  • the printed non-woven-fabric may be advantageously produced with a continuous print speed up to 400 m/min, preferably ranging between 20 m/min and 300 m/min.
  • the NWF may be printed over only a small %age with respect to its surface (2-3%) up to a coverage of 100% of its surface, depending on the use of the NWF itself, i.e. : personal hygiene, domestic hygiene, matting, non-woven fabric for clothing, table-cloths, handkerchiefs, curtains (furnishings), bags, containers for items.
  • the aforesaid adjustments of the control and command unit avoid the problems associated with the formation of creases as well as the danger of tearing the non-woven-fabric support despite maintaining a high print speed.
  • machine dynamics control program on suitable electronic recipes, monitorable through an electrical axis, electronic colour control and closed loop video camera.
  • the press roller 2 is substituted by a belt press 102, onto which press a plurality of engraved rollers 103 (up to a number of 12 rollers).
  • the press belt 102 is constituted by a tape, closed on itself and provided with through holes 121, of such dimensions as to house the NWF T to be printed.
  • the press belt 102 is supported in a rotating manner by a plurality of rollers 200.
  • Such equipment will naturally comprise a plurality of guide rollers A-F and, aside from the substitution of the press roller with the press belt, will be entirely similar to the first embodiment described above with reference to figures 1 and 2 . Therefore, reference is made to the previous description for understanding the structure and the operation of the present equipment, wherein the reference numerals identical to the reference numerals reported herein, have the same meaning.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (28)

  1. Vorrichtung (1;100) zum Bedrucken eines Vliesstoffes, wobei die Vorrichtung aufweist:
    einen angetriebenen Träger (2; 102) zum Transportieren einer Vliesstoffbahn (T),
    mindestens einen angetriebenen Druckkörper (3;103) zum Durchführen des Bedruckens und
    eine Überwachungs- und Steuereinheit (6), die operativ sowohl mit dem Träger wie auch mit dem mindestens einen Druckkörper verbunden ist, um elektrische Signale, die von dem Träger und dem mindestens einen Druckkörper herkommen, zu erfassen, die Signale in numerische Werte, die den Zustand der Winkelgeschwindigkeit und des Drehmoments repräsentieren, umzuwandeln, die numerischen Werte mit Raten von vorgegebenen numerischen Werten der Winkelgeschwindigkeit und des Drehmoments zu vergleichen und Signale zu dem Träger und dem mindestens einen Druckkörper zu senden, um in dem Fall, dass in den Werten Abweichungen auftreten, die aus den Raten fallen, Korrekturen vorzunehmen,
    dadurch gekennzeichnet, dass
    der angetriebene Träger (2;102) mit Durchgangslöchern (21;121) versehen ist, die mit Halteeinrichtungen (4) zusammenwirken, um die Vliesstoffbahn (T) am Träger zu halten, und dadurch, dass
    die Vorrichtung (1;100) eine Bilderfassungsvorrichtung (7) aufweist, die operativ mit der Überwachungs- und Steuereinheit (6) verbunden ist, um den Vliesstoff-Träger (2;102) permanent zu überwachen, um das Auftreten von Falten oder von Abweichungen im Druck bezüglich des vorgegebenen Standards zu detektieren.
  2. Vorrichtung (1;100) nach Anspruch 1, wobei der Träger (2;121) von einem Motor (2M) angetrieben wird und wobei der mindestens eine Druckkörper (3; 103) von einem Motor (3M) angetrieben wird.
  3. Vorrichtung (1) nach Anspruch 1 oder 2, wobei der Träger (2) ein zylindrischer Träger ist, der durch eine Presswalze verkörpert ist.
  4. Vorrichtung (100) nach einem der Ansprüche 1 bis 2, wobei der Träger (102) ein Pressriemen ist.
  5. Vorrichtung (100) nach Anspruch 4, wobei der Pressriemen (102) ein in sich geschlossener perforierter Riemen ist.
  6. Vorrichtung (1;100) nach einem der Ansprüche 1 bis 5, wobei der mindestens eine Druckkörper (3; 103) zwischen zwei und zwölf rotierende Gravierwalzen aufweist, die einzeln und unabhängig von Motoren (3M) betätigt werden.
  7. Vorrichtung (1;100) nach einem der Ansprüche 2 bis 6, wobei die Halteeinrichtungen (4) Sauggebläse aufweisen, die die Aufgabe haben, Luft von außerhalb des Trägers (2;102) durch die Durchgangslöcher (21;121) in sein Inneres zu saugen.
  8. Vorrichtung (1;100) nach Anspruch 7, wobei die Sauggebläse (4) durch Ventilatoren verkörpert sind.
  9. Vorrichtung (1;100) nach Anspruch 7, wobei die Sauggebläse (4) durch Pumpen des Typs Kompressor oder Vakuumpumpe verkörpert sind.
  10. Vorrichtung (1;100) nach einem der Ansprüche 7 bis 9, wobei die Sauggebläse mit einem Wasserseparator (5) verbunden sind.
  11. Vorrichtung (1;100) nach Anspruch 10, wobei der Separator (5) ein Kondensator ist.
  12. Vorrichtung (1;100) nach Anspruch 10, wobei der Separator (5) durch einen mechanischen und physikalischen Vorgang das Wasser von der Luft trennt.
  13. Vorrichtung (1;100) nach Anspruch 12, wobei der Separator ein cochlea-förmiger Destillator ist.
  14. Vorrichtung (1;100) nach einem der Ansprüche 1 bis 13, ferner mit geeigneten Führungseinrichtungen (A,B,C,D,E,F) zum Führen und Tragen der einlaufenden und auslaufenden Vliesstoffbahn (T) in die und aus der Vorrichtung.
  15. Vorrichtung (1;100) nach Anspruch 14, wobei die Führungseinrichtungen (A,B,C,D,E,F) Rollen sind, die einzeln und unabhängig von entsprechenden Motoren (AM,BM,CM,DM,EM,FM) angetrieben werden.
  16. Vorrichtung (1;100) nach Anspruch 14 oder 15, wobei mindestens ein Paar (B,C) der Führungseinrichtungen an dem in die Druckstation einlaufenden Vlies angeordnet sind und Weitungseinrichtungen umfassen, die ein Vergrößern der Höhe des Vliesstoffes erlauben.
  17. Vorrichtung (1;100) nach Anspruch 1, wobei die Vorrichtung (7) eine Fotokamera oder eine Videokamera ist.
  18. Vorrichtung (1;100) nach Anspruch 1, wobei die Vorrichtung (7) eine digitale Vorrichtung ist.
  19. Verfahren zum Bedrucken eines Vliesstoffes mit den folgenden Schritten:
    - Bereitstellen einer Vliesstoffbahn;
    - Bereitstellen einer Vorrichtung zum Bedrucken des Vliesstoffes, die einen angetriebenen Träger zum Transportieren des Vliesstoffes und mindestens einen Druckkörper aufweist, nach einem der Ansprüche 1 bis 18;
    - Beschicken der Vomichtung mit der Vliesstoffbahn;
    - Durchführen des Bedruckens des Vliesstoffes unter Überwachung und Steuerung mittels einer Überwachungs- und Steuereinheit,
    wobei die Überwachungs- und Steuereinheit operativ sowohl mit dem Träger wie auch mit dem mindestens einen Druckkörper verbunden ist, um
    elektrische Signale, die von dem Träger und dem mindestens einen Druckkörper herkommen, zu erfassen,
    die Signale in numerische Werte, die den Zustand der Winkelgeschwindigkeit und des Drehmoments repräsentieren, umzuwandeln,
    die numerischen Werte mit Raten von vorgegebenen numerischen Werten der Winkelgeschwindigkeit und des Drehmoments zu vergleichen und
    Signale zu dem Träger und dem mindestens einen Druckkörper zu senden, um in dem Fall, dass in den Werten Abweichungen auftreten, die aus den Raten fallen, Korrekturen vorzunehmen,
    wobei die von der Überwachungs- und Steuereinheit durchgeführte Steuerung mit einer zusätzlichen automatischen Steuerung mit geschlossener Schleife implementiert ist, die von einer Bilderfassungsvorrichtung unterstützt wird.
  20. Verfahren nach Anspruch 19, wobei die Überwachungs- und Steuereinheit separat und unabhängig auf jeden Motor wirkt, der den entsprechenden Druckkörper der Vomichtung betätigt, derart, um Bezug auf die gleiche elektrische Achse zu machen.
  21. Verfahren nach Anspruch 19 oder 20, ferner mit einem Schritt des Haltens der Vliesstoffbahn an der Außenfläche des Trägers mit Hilfe von Halteeinrichtungen.
  22. Verfahren nach Anspruch 21, wobei der Arbeitsschritt der Halteeinrichtungen von Sauggebläsen durchgeführt wird, die durch Ansaugen von Luft von außerhalb des Trägers durch Durchgangslöcher ins Innere des Trägers den Vliesstoff am Träger halten.
  23. Verfahren nach einem der Ansprüche 21 bis 22, ferner mit einem Schritt der Steuerung der Tätigkeit der Halteeinrichtungen durch die Überwachungs- und Steuereinheit.
  24. Verfahren nach einem der Ansprüche 22 bis 23, mit einem Schritt des Abscheidens von Wasser aus der durch die Saugebläse eingesaugten Luft.
  25. Verfahren nach einem der Ansprüche 19 bis 24, wobei der Schritt des Bedruckens mit Hilfe von flexographischen (Tinte) oder serigraphischen (Farbpaste) Techniken erfolgt.
  26. Verfahren nach Anspruch 25, mit einem Schritt der Farbmittelüberwachung durch die Überwachungs- und Steuereinheit unter Optimierung der Eigenschaften jedes Farbmittels, beispielsweise Fluss, Druck und Viskosität, in Abhängigkeit vom Typ des zu bedruckenden Vliesstoffes.
  27. Verfahren nach einem der Ansprüche 19 bis 26, mit einem Weitungsschritt, um die Beibehaltung der Produkthöhe sicherzustellen.
  28. Verfahren nach einem der Ansprüche 19 bis 27, wobei das Bedrucken einer nassen oder trockenen Vliesstoffbahn mit einer Geschwindigkeit von bis zu 400m/min erfolgt.
EP04720966.3A 2004-02-06 2004-03-16 Druckverfahren und druckvorrichtung für vliesstoff Expired - Lifetime EP1718464B1 (de)

Applications Claiming Priority (2)

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IT2004000042 2004-02-06
PCT/IT2004/000127 WO2005075199A1 (en) 2004-02-06 2004-03-16 A process and equipment for printing on non-woven-fabric

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US20070163454A1 (en) 2007-07-19
EP1718464A1 (de) 2006-11-08
WO2005075199A1 (en) 2005-08-18
US8307765B2 (en) 2012-11-13
ES2554529T3 (es) 2015-12-21

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